Charles e



(No Model.)

0. E. HART.

DRIVE CHAIN.

No. 473,392. Patented Apr. 19, 1892.

aha-r ATENT union.

CHARLES E. HART, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE STANLEYIVORKS, OF SAME PLACE.

DRIVE-CHAIN.

SPECIFICATION forming part of Letters Patent No. 473,392, dated April19, 1892. Application filed February 1. 1892- Serial No. 419,869- iNomodel.)

part, substantially cylindrical in form, so as I To all whom itmayconccrn:

Be it known that I, CHARLES E. HART, of New Britain, in the county ofHartford and State of Connecticut, have invented certain newand usefulImprovements in Drive-Chain Links, of which the following is a full,clear, and exact description,whereby any one skilled in the art can makeand use the same.

My invention relates to the general class of drive-chains that are madeup of a number of separable links that may be readily engaged with anddisengaged from each other without requiring the link to be opened outat any joint; and the object of my invention is to provide a cheap,simple, and durable link usable in making up a chain of this kind.

My invention consists in the details of the several parts making up thedrive-chain link as awhole, as more particularly hereinafter described,and pointed out in the claim.

Referring to the drawings, Figure 1 is a plan view of a blank from whichthe improved link is formed. Fig. 2 is a detail top View of the linkafter it has been formed to shape. Fig. 3 is a detail back View of thecompleted link. Fig. 4 is a detail View in central section of the linkon the plane denoted by the lineac :1: of Fig. 2.

In the accompanying drawings, theletter a denotes the blank that is cutor stamped from a sheet of metal of a thickness determined by the sizeof the link and the work -to be done by the chain composed of a numberof such links. The blank is substantially oblong in outline and is cutaway in the center at a to form the opening into which the teeth of thesprocket-wheelextend when the drivechain is in use.

One end of the blank a is of a shape and of a length adapting it to berolled up to form a pintle l), or the pintle may be formed by swaging upthe metal, the only essential being that the pintle shall be,'as to itscenter to fit into the socket c in the knuckle c, that is formed at theopposite end of the link. The knuckle end of the blank and the frontpart of the side parts (1 are formed of a double thickness of metal atthe edges by folding the corners of the blank over upon the main partand rolling up the knuckle, so that the edge d is a folded edge and theends 0 of the knuckle are made of a double thickness. The inner edge ofthe knuckle is formed by swaging up a lip e, the edge of which extendssufficiently above the plane of the frame of the link as to present arounded bearing-face e to the side of the sprocket-tooth with which thatside of the knuckle comes into contact in the use of the chain. Theknuckle is rolled into a cylindrical shape and is of a length slightlyless than the Width of the opening a near the pintle, so that when thepintle is inserted in the pintle-socket c the upper end of the knuckleextends through the opening a and partly around the pintle, the severallinks being thus pivoted together in succession and forming, when thusunited, a continuous chain. Such a link is comparatively cheap inconstruction and is extremely strong,-

as described.

CHARLES E. HART.

Witnesses:

CHAS. L. BURDETT, A. B. JENKINS.

